Join Date: Jun 2007
Location: Huntsville/Arab alabama
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It is supposed to be a cold weather warm up aid. The way it is supposed to work is when the truck is cold it closes the butterfly valve and pretty much blocks off the exhaust kinda like outing a potato in the tail pipe. When it is on you should be able to hear it and the truck should have almost no power, and if everything is working right it should blow open if you get on the throttle hard enough. After the engine is warm enough it should open and remain open until the engine cools too much.
IF (notice ‘if’ is capitalized) it were to stay closed it could cause extremely high egt and make bad things happen.
Stock exhaust or performance exhaust makes no difference to this device, it is the part that you hook the exhaust to so it is there on both setups.